Modern Audis (like the RS5) with the active differential option use technology to overcome their substandard design. So they handle pretty well. Not unlike a modern 911.

Regular Audis though -

I concur with the earlier advice to fix that air pressure and give the tires a few more miles to get all of the release agent, er, released.

You may find that the funky 911 rear "steering" that Porsche employs by selective brake application makes the rear end feel kind of strange when cornering, but to me it was always more of a "tuck in" feel than a lateral slip. Just something to keep in mind as you put on the miles.

 

No way any 991 Carrera is slippery in the rear, unless tires r new or wrong, or u r driving it improperly by entering corners to hot and lifting in the turn, instead of braking in a straight line and gently increasing throttle as much as possible thru the turn. The rear end of my 991 C2S sticks like glue, with OEM Pirelli P-Zeros, and is planted way more firmly than the rear of my 981 Cayman S.